17-7PH Stainless Steel Sheet, Plate & Coil - AMS 5528, UNS S17700
17-7 PH is a precipitation-hardened stainless steel that is well suited for aerospace and other applications requiring high strength and good corrosion resistance and formability. Type 17-7 PH is a Chromium-Nickel-Aluminum, austenitic stainless steel. It is the most formable of all PH grades and has the highest strength and hardness. It is less magnetic than other PH grades and offers minimal distortion upon heat treatment. This material maintains its valuable properties at temperatures up to 800°F (427° C).
- Inventory & Specs
- Chemical Composition
- Physical Properties
- Mechanical Properties
- Datasheet
- Additional Info
- FAQs
Inventory Size Ranges for 17-7 PH
| Type | Thickness | AMS Standards | ASTM | UNS | ASME | Get a Quote |
|---|---|---|---|---|---|---|
| Coil | 0.020" - 0.125" | AMS 5528 | ASTM A 693 | UNS S17700 | ASME SA 693 | Get a Quote |
| Sheet | 0.020" - 0.125" | AMS 5528 | ASTM A 693 | UNS S17700 | ASME SA 693 | Get a Quote |
| Plate | 0.1875" | AMS 5528 | ASTM A 693 | UNS S17700 | ASME SA 693 | Get a Quote |
Characteristics of 17-7
17‑7 PH Stainless Steel is a precipitation‑hardening alloy that combines the corrosion resistance of stainless steel with superior strength and fatigue properties. It offers excellent spring characteristics, high tensile strength, and good oxidation resistance up to approximately 1400°F (760°C). Its ability to maintain mechanical integrity under cyclic loading makes it ideal for aerospace, chemical processing, and industrial applications where both durability and precision are critical.
Working with 17-7
17‑7 PH is typically supplied in the annealed condition and can be formed and machined before heat treatment. After forming, it undergoes a controlled precipitation‑hardening process to achieve its final strength and spring properties. While it offers good corrosion resistance, care should be taken during welding and fabrication to maintain its mechanical performance. Its predictable heat‑treat response and dimensional stability make it a preferred choice for precision components such as springs, diaphragms, and high‑stress structural parts.
Other industry standards we comply with:
- W.NR 1.4541
- PWA-LCS
- GE Aircraft Engine (GT193)
- GE Aviation S-SPEC-35 AeDMS S-400
- RR SABRe Edition 2
- DFARS Compliant
Common Trade Names
- 17-7 (® AK Steel)
- ATI 17-7 (™ Allegheny Technologies)
- T-17-7 Stainless Steel (ThyssenKrupp VDM)
Industry Applications for 17-7 PH
- Aerospace applications
- Chemical processing equipment
- Oil and petroleum refining equipment
- Food grade stainless steel for processing equipment
- General metalworking
Chemical Composition
| Element | Min | Max | |
|---|---|---|---|
| C | Carbon | - | 0.09 |
| Mn | Manganese | - | 1.00 |
| P | Phosphorus | - | 0.05 |
| S | Sulfur | - | 0.03 |
| Si | Silicon | - | 1.00 |
| Cr | Chromium | 16.00 | 18.00 |
| Ni | Nickel | 6.75 | 7.75 |
| Al | Aluminum | 0.75 | 1.50 |
Physical Properties
| Property | Value |
|---|---|
| Density | 0.2820 lb/in3 |
| Melting Range | 2560 - 2625°F (1404 - 1440°C) |
| Electrical Resistivity (Annealed Condition) | 80 Microhm-cm |
| Temperature Range | Coefficients | ||
|---|---|---|---|
| °C | °F | μm/m°C | in/in/°F·106 |
| 21-93 | 70-200 | 15.3 | 8.5 |
| 21-204 | 70-400 | 16.2 | 9.0 |
| 21-316 | 70-600 | 17.1 | 9.5 |
| 21-427 | 70-800 | 17.3 | 9.6 |
| Temperature Range | Coefficients | ||
|---|---|---|---|
| °C | °F | W/m·K | Btu/(hr/ft²/in/°F) |
| 149 | 300 | 16.87 | 117 |
| 260 | 500 | 18.46 | 128 |
| 449 | 840 | 21.05 | 146 |
| 482 | 900 | 21.05 | 146 |
| Oersteds | AT/m | μ |
|---|---|---|
| 25 | 1989 | 1.4 - 3.4 |
| 50 | 3878 | 1.4 - 3.6 |
| 100 | 7956 | 1.4 - 3.5 |
| 200 | 15.912 | 1.4 - 3.2 |
| max | max | 1.4 - 3.6 |
Mechanical Properties
| Property | Value |
|---|---|
| Ultimate Tensile Strength psi (MPa) | 130,000 (896) |
| 0.2% Tensile Yield Strength psi (MPa) | 40,000 (276) |
| Elongation % in 2" (50mm) | 35 |
| Hardness Rockwell | B85 |
Datasheet
Additional Info
Brief History of 17-7 PH
17-7 PH is a precipitation‑hardening stainless steel containing approximately 17% chromium and 7% nickel, with aluminum added to enable hardening. It was introduced during the World War II and early Cold War era, when the U.S. needed high strength, corrosion resistant alloys for aircrafts and defense applications. It became known as a "workhorse alloy" due to its combination of strength, formability, and corrosion resistance.
How 17-7 PH Was Developed
17‑7 PH was engineered as part of a family of precipitation‑hardening stainless steels created to meet demanding aerospace requirements. During the development of this alloy the goal was to create a material that would provide higher strength than austenitic stainless steels, maintain good corrosion resistance, offer excellent spring properties and fatigue resistance, and be able to be heat-treat hardenable. Metallurgists added aluminum which allowed formation of strengthening precipitates during aging heat treatment. The alloy was designed to be austenitic when annealed and martensitic after transformation, enabling both formability and high strength. 17-7 PH was also developed to be stable at temperatures up to 600 °F (315 °C), making it ideal for aerospace springs and diaphragms.
Early Applications of 17-7 PH
Because of its unique combination of formability, strength, and corrosion resistance, early adoption centered on aerospace springs and diaphragms, aircraft structural components, defense hardware, and chemical processing equipment. Its ability to be cold worked and then precipitation hardened made it especially valuable for precision springs, which became one of its signature applications.
How 17-7 PH Is Used Today
17-7 PH remains widely used across industries that require high strength, fatigue resistance, and corrosion resistance. Some of the modern applications include:
- Aerospace: Springs, bellows, diaphragms, fasteners, actuation systems
- Industrial & Energy: Springs, washers, petrochemical processing equipment, pressure diaphragms
- Medical: Surgical instruments, orthopedic tools, precision springs
- Automotive & Transportation: High fatigue suspension springs, high temperature exhaust components
Your Trusted Supplier for 17-7 PH
United Performance Metals offers coil and sheet 0.020" - 0.125" and plate 0.1875".
Product FAQs
The key properties of 17-7 PH include high tensile and yield strength, excellent fatigue resistance, good corrosion resistance, and good formability in the annealed condition.
17-7 PH provides better formability, superior spring properties, and higher fatigue resistance compared to 17-4 PH. 17-4 PH has higher overall strength, is easier to machine, and is more widely used in structural components.
Machinability is moderate for 17-7 PH. It is best machined in the annealed state and becomes more difficult to machine after hardening. Sharp tooling and slower speeds are recommended when working with 17-7 PH.
17-7 PH maintains good strength and stability up to 600 °F (315 °C). Above this temperature, strength and corrosion resistance begin to decline.
In the annealed condition, 17-7 PH is non-magnetic. After heat treatment it becomes magnetic. This dual behavior is useful in applications requiring formability first and magnetism later.